Isothermal vapour–liquid equilibria in the binary and ternary systems composed of 2,2,4-trimethylpentane, 2-methyl-1-propanol, and 4-methyl-2-pentanone
Highlights
► We have measured new experimental data on vapour–liquid equilibria at isothermal conditions. ► Three binary and one ternary systems consisting of isooctane + isobutanol + isobutyl methyl ketone were investigated. ► Correlation of data with use of the Wilson and NRTL equation. ► Prediction of phase equilibria in ternary system based on binary data.
Introduction
New results of a continuing project dealing with phase equilibria (VLE) in mixtures belonging to distinct families of organic compounds are reported in this paper. Vapour–liquid equilibria are determined for three binary and one ternary systems containing alcohol, hydrocarbon and ketone. Within the series of papers, the systems of components having a common alkyl group (isopropyl or tert-butyl), namely 2-propanol + diisopropyl ether + 2,2,4-trimethylpentane [1], tert-butanol + 2,2,4-trimethylpentane + 1-tert-butoxy-2-propanol [2], tert-butyl methyl ether + tert-butanol + 2,2,4-trimethylpentane [3], 2-propanol + diisopropyl ether + 1-methoxy-tert-butyl methyl ether [4], 2-propanol + diisopropyl ether + 4-methyl-2-pentanone [5], 2-methylpentane + 3-methyl-2-butanone + 3-methyl-2-butanol [6], 2-propanol + 3-methyl-2-butanone + 2,2,4-trimethylpentane [7] and tert-butyl methyl ether + 3,3-dimethyl-2-butanone + 2,2-dimethyl-1-propanol [8] have already been investigated. Compounds used in this paper contain also both ketone, and alcohol, and isobutyl groups, namely, 2,2,4-trimethylpentane, 2-methyl-1-propanol, and 4-methyl-2-pentanone. The new data were measured at the three constant temperature levels, particularly at 333.15, 348.15 and 364.15 K.
Section snippets
Apparatus and procedure
Experimental VLE data were measured in an all glass circulation still chargeable with 150 ml of liquid phase; essentially, it was the Dvorak–Boublík type which is quoted in our previous papers (e.g. [7]). The pressure was measured indirectly via the boiling point of water in an ebulliometer connected in parallel to the still; the uncertainty is ±0.1% of the measured value. The equilibrium temperature was determined with the digital thermometer F250 (ASL, United Kingdom) calibrated against a
Results
The direct experimental x–y–P values together with the activity coefficients, γ1, γ2, and ΔGE (evaluated from the NRTL correlation) for the binary systems are given in Table 1. All three binary systems are azeotropic. The data were correlated using the Wilson and NRTL equation in the forms as follows (expressions for ln γ2 can be easily obtained after interchanging indices 1 and 2):
(1) The Wilson equationwhere A12 = (V1/V2)exp[− (λ12 − λ11)/RT], A21 = (V2/V1
Discussion and conclusions
No published vapour–liquid equilibrium data for the studied systems were found in the bibliography covering the period 1888–2007 [20]. One data set was found for the 2,2,4-trimethylpentane + 2-methyl-1-propanol system in [19]; unfortunately, those data were measured at isobaric conditions, therefore preventing from direct comparison. Nevertheless, the reliability of both the data and correlation procedure is verified by the fact that the resulting standard deviations are approximately
Acknowledgement
The authors acknowledge the partial support of the Grant Agency of the Czech Republic (grant no. 104/07/0444).
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Cited by (4)
Vapour-liquid equilibria in binary and ternary systems composed of 2,3-dimethylbutane, diisopropyl ether, and 3-methyl-2-butanone at 313.15, 323.15 and 313.15K
2013, Fluid Phase EquilibriaCitation Excerpt :Here we determined the vapour–liquid equilibria (VLE) for three binary and one ternary system containing hydrocarbon, ether, and ketone. In a series of our earlier papers, we have already investigated systems having a common alkyl group (isopropyl or tert-butyl), namely 2-propanol + diisopropyl ether + 2,2,4-trimethylpentane [1], tert-butanol + 2,2,4-trimethylpentane + 1-tert-butoxy-2-propanol [2], tert-butyl methyl ether + tert-butanol + 2,2,4-trimethylpentane [3], 2-propanol + diisopropyl ether + 1-methoxy-tert-butyl methyl ether [4], 2-propanol + diisopropyl ether + 4-methyl-2-pentanone [5], 2-methylpentane + 3-methyl-2-butanone + 3-methyl-2-butanol [6], 2-propanol + 3-methyl-2-butanone + 2,2,4-trimethylpentane [7], tert-butyl methyl ether + 3,3-dimethyl-2-butanone + 2,2-dimethyl-1-propanol [8], and 2,2,4-trimethylpentane + 2-methyl-1-propanol + 4-methyl-2-pentanone [9]. The next in the series of experiments aimed at completing our database are systems containing compounds that share the alkyl group [isopropyl (CH3)2CH], ether group O, and carbonyl group CO with the already investigated systems.
Isothermal (vapour + liquid) equilibria in the binary and ternary systems composed of 2-propanol, 2,2,4-trimethylpentane, and 2,4-dimethyl-3-pentanone
2012, Journal of Chemical ThermodynamicsCitation Excerpt :Vapour + liquid) equilibria are determined for three binary and one ternary systems containing alcohol, hydrocarbon and ketone. Within the series of papers, the systems of components having a common alkyl group (isopropyl or tert-butyl), namely (2-propanol + diisopropyl ether + 2,2,4-trimethylpentane) [1], (tert-butanol + 2,2,4-trimethylpentane + 1-tert-butoxy-2-propanol) [2], (tert-butyl methyl ether + tert-butanol + 2,2,4-trimethylpentane) [3], (2-propanol + diisopropyl ether + 1-methoxy-tert-butyl methyl ether) [4], (2-propanol + diisopropyl ether + 4-methyl-2-pentanone) [5], (2-methylpentane + 3-methyl-2-butanone + 3-methyl-2-butanol) [6], (2-propanol + 3-methyl-2-butanone + 2,2,4-trimethylpentane) [7], (tert-butyl methyl ether + 3,3-dimethyl-2-butanone + 2,2-dimethyl-1-propanol) [8], and (2,2,4-trimethylpentane + 2-methyl-1-propanol + 4-methyl-2-pentanone) [9] have already been investigated. On concluding of such extensive experimental studies, the processing of this database would result, e.g. in evaluation of better parameters for group contribution methods.